Simulation results for spatial reuse in 11ax Month Year doc.: IEEE 802.11-yy/xxxxr0 November 2015 Simulation results for spatial reuse in 11ax Date: 2015-11-09 Authors: Jinmin Kim, LG Electronics John Doe, Some Company

Month Year Doc Title November 2015 Abstract In this contribution, we observe the performance of static OBSS PD level and transmit power control in the integrated(PHY+MAC) simulation John Doe, Some Company

Spatial Reuse Schemes Static OBSS PD level November 2015 Spatial Reuse Schemes Static OBSS PD level To apply a fixed OBSS PD level after BSS COLOR filtering OBSS PD level : -76(RX sensitivity in 80MHz), -71, -66, -61, -56dBm Transmit power control (TPC) To change transmit power based on path-loss Case A. TPC is applied to both AP and STA Case B. TPC is only applied to STA Detail is explained in slide.#16

Simulation Scenario Simplified residential scenario (SS1) November 2015 Simulation Scenario Simplified residential scenario (SS1) Considering only 1st floor in SS1 80MHz BSS at 5GHz 20 APs and 10 STAs per AP A CBR traffic model, which is heavier than [1], is considered DL: 100Mbps per BSS (cf. 60Mbps in [1]) UL: 10Mbps per BSS (cf. 6Mbps in [1]) Each BSS randomly selects a channel among 3 channels

PHY/MAC-Integrated Simulation Parameter November 2015 PHY/MAC-Integrated Simulation Parameter Simulation Time 10s (+initial 1s) Number of Drops 10 Default Tx Power (AP/STA) 20/15dBm Default Rx Sensitivity -76dBm(80MHz) CCA-ED -56dBm(80MHz) Antenna Gain (AP/STA) 0/-2 dBi Channel TGn Channel D (pathloss, fading) Noise Figure 7dB Noise Floor -101dBm per 20MHz Rate Control Algorithm 10 % PER based MCS selection [2] Feedback GENIE MSDU size (bytes) 1472 Max Aggregation number 64 Max Retransmission Metrics Throughput, SIR, # of DL/UL transmission1) RTS/CTS off 1) Total # of DL/UL transmission per AP/STA through the whole simulation time, respectively

Classification of BSSs November 2015 Classification of BSSs According to the received interference level Category I: high interference by the same channel nearby Category II: medium interference by the same channel one BSS away Category III: low interference by the same channel two BSS away

November 2015 Static OBSS PD level

Simulation Result - Static OBSS PD level (1/7) November 2015 Simulation Result - Static OBSS PD level (1/7) 5% Tput gain when OBSS PD level is increased to -56dBm DL offered rate UL offered rate Observation point: When OBSS PD level gets higher, performance is slightly improved since categories II&III do not provide gains - see the following slides Increasing 5% gain

Simulation Result - Static OBSS PD level (2/7) November 2015 Simulation Result - Static OBSS PD level (2/7) Result on Category I (high interference case) 12% throughput gain when OBSS PD level is -56dBm DL offered rate UL offered rate Observation point: Performance gain gets higher when OBSS PD level increases - reason in the following slide Increasing 12% gain

Simulation Result - Static OBSS PD level (3/7) November 2015 Simulation Result - Static OBSS PD level (3/7) Analysis on Category I (high interference case) 1) Increasing Increasing Slightly Decreasing Slightly Decreasing Observation point: The increased number of transmission can cover up the decreased SIR when OBSS PD level gets higher. 1) Total # of DL transmission per AP through the whole simulation time

Simulation Result - Static OBSS PD level (4/7) November 2015 Simulation Result - Static OBSS PD level (4/7) Result on Category II (medium interference case) Throughput gain is not observed DL offered rate UL offered rate Observation point: Even if performance is higher than category I, throughput gain is not observed So, no gain in category II makes large impact on the small gain of overall performance

Simulation Result - Static OBSS PD level (5/7) November 2015 Simulation Result - Static OBSS PD level (5/7) Analysis on Category II (medium interference case) Observation point: SIR and the number of transmission do not get better when OBSS PD level increase.

Simulation Result - Static OBSS PD level (6/7) November 2015 Simulation Result - Static OBSS PD level (6/7) Result on Category III (low interference case) Throughput gain is not observed DL offered rate UL offered rate Observation point: Throughput gain is not observed As mentioned in previous slide, no gain in category III makes the largest impact on the small gain of overall performance

Simulation Result - Static OBSS PD level (7/7) November 2015 Simulation Result - Static OBSS PD level (7/7) Analysis on Category III (low interference case) Observation point: As mentioned in category II, SIR and the number of transmission do not get better when OBSS PD level increase.

TPC (Case a. TPC is applied to both AP and STA) November 2015 TPC (Case a. TPC is applied to both AP and STA)

TPC algorithm TPC is modified from [1] for 80MHz BW November 2015 TPC algorithm TPC is modified from [1] for 80MHz BW Updated TxPower = max(LowerLimitationLevel, RX sensitivity + TPC Margin + Estimated Path Loss) TPC margin : 20, 25dB LowerLimitationLevel : -56dBm Max Updated TxPower : 20dBm

Simulation Result (Case a. TPC is applied to AP&STA) November 2015 Simulation Result (Case a. TPC is applied to AP&STA) There is no performance gain when TPC is applied to both AP and STA DL offered rate UL offered rate Observation point: When TPC is applied to AP&STA, throughput gain is not observed since all categories do not provide gains - see the following slides

Simulation Result (Case a. TPC is applied to AP&STA) November 2015 Simulation Result (Case a. TPC is applied to AP&STA) Result on Category I (high interference case) Throughput gain is not observed DL offered rate UL offered rate Observation point: throughput gain is not observed - reason in the following slide

Simulation Result (Case a. TPC is applied to AP&STA) November 2015 Simulation Result (Case a. TPC is applied to AP&STA) Analysis on Category I (high interference case) Increasing Decreasing Decreasing Decreasing Observation point: The increased number of DL transmission compensates barely for the loss by decreased SIR and decreased number of UL transmission

Simulation Result (Case a. TPC is applied to AP&STA) November 2015 Simulation Result (Case a. TPC is applied to AP&STA) Result on Category II (medium interference case) Throughput gain is not observed DL offered rate UL offered rate Observation point: Even if performance is higher than category I, throughput gain is not observed The reason of this trend is same as category I

Simulation Result (Case a. TPC is applied to AP&STA) November 2015 Simulation Result (Case a. TPC is applied to AP&STA) Result on Category III (low interference case) Throughput gain is not observed DL offered rate UL offered rate Observation point: Even if performance is higher than category II, throughput gain is not observed The throughput of DL/UL corresponds to the offered data rate(100/10Mbps)

TPC (Case b. TPC is only applied to STA not AP) November 2015 TPC (Case b. TPC is only applied to STA not AP)

Simulation Result (Case b. TPC is only applied to STA not AP) November 2015 Simulation Result (Case b. TPC is only applied to STA not AP) 30% throughput gain when TPC margin is 20dB DL offered rate UL offered rate Observation point: When TPC is applied to only STA, performance is improved - see the following slides 30% gain 20% gain

Simulation Result (Case b. TPC is only applied to STA not AP) November 2015 Simulation Result (Case b. TPC is only applied to STA not AP) Result on Category I (high interference case) 66% throughput gain when TPC margin is 20dB DL offered rate UL offered rate Observation point: The DL performance is significantly improved when TPC is applied to only STA - reason in the following slide 66% gain 44% gain

Simulation Result (Case b. TPC is only applied to STA not AP) November 2015 Simulation Result (Case b. TPC is only applied to STA not AP) Analysis on Category I (high interference case) Increasing Increasing Decreasing Observation point: The increased DL SIR and increased number of DL transmission makes the performance gain. So, DL performance can be enhanced significantly.

Simulation Result (Case b. TPC is only applied to STA not AP) November 2015 Simulation Result (Case b. TPC is only applied to STA not AP) Result on Category II (medium interference case) 12% throughput gain when TPC margin is 20dB DL offered rate UL offered rate Observation point: The reason of this trend is same as category I 12% gain 8% gain

Simulation Result (Case b. TPC is only applied to STA not AP) November 2015 Simulation Result (Case b. TPC is only applied to STA not AP) Result on Category III (low interference case) Throughput gain is not observed DL offered rate UL offered rate Observation point: Even if performance is higher than category II, throughput gain is not observed The throughput of DL/UL corresponds to the offered data rate(100/10Mbps)

Conclusion We simulated 2 spatial reuse schemes Month Year Doc Title November 2015 Conclusion We simulated 2 spatial reuse schemes Static OBSS PD level, TPC Considering static OBSS PD level, the performance can be enhanced slightly This gain is derived from increased number of transmissions (enhanced Tx opportunity) Performance gain can be dependent on traffic model. So, we will simulate with other traffic model for the future work If TPC is applied to STA, performance can be enhanced significantly by reduced OBSS UL interference and increased number of DL transmissions John Doe, Some Company

Month Year Doc Title November 2015 Reference [1] 11-15/10415r0 Dynamic CCA control and TPC Simulation Results with SS1~SS3 [2] 11-14/620r0 link adaptation for PHY SLS calibration John Doe, Some Company

Appendix A: Selected Channel Index November 2015 Appendix A: Selected Channel Index 2 1 1 2 Low interference case 0Drop 5Drop 2 1 1 2 Medium interference case 1Drop 6Drop High interference case 2 1 1 2 2Drop 7Drop 2 1 2 1 3Drop 8Drop 2 1 2 1 4Drop 9Drop